/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.nutch.indexer;

import java.nio.ByteBuffer;
import java.util.List;

import org.apache.avro.util.Utf8;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.nutch.crawl.CrawlStatus;
import org.apache.nutch.parse.ParseStatusUtils;
import org.apache.nutch.parse.ParseUtil;
import org.apache.nutch.parse.ParserJob;
import org.apache.nutch.protocol.Content;
import org.apache.nutch.protocol.Protocol;
import org.apache.nutch.protocol.ProtocolFactory;
import org.apache.nutch.protocol.ProtocolOutput;
import org.apache.nutch.protocol.ProtocolStatusCodes;
import org.apache.nutch.protocol.ProtocolStatusUtils;
import org.apache.nutch.storage.WebPage;
import org.apache.nutch.util.NutchConfiguration;
import org.apache.nutch.util.StringUtil;
import org.apache.nutch.util.URLUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Reads and parses a URL and run the indexers on it. Displays the fields
 * obtained and the first 100 characters of their value
 * 
 * Tested with e.g. ./nutch org.apache.nutch.indexer.IndexingFiltersChecker
 * http://www.lemonde.fr
 * 
 * @author Julien Nioche
 **/

public class IndexingFiltersChecker extends Configured implements Tool {

	public static final Logger LOG = LoggerFactory
			.getLogger(IndexingFiltersChecker.class);

	public IndexingFiltersChecker() {

	}

	public int run(String[] args) throws Exception {
		String contentType = null;
		String url = null;

		String usage = "Usage: IndexingFiltersChecker <url>";

		if (args.length != 1) {
			System.err.println(usage);
			return -1;
		}

		url = URLUtil.toASCII(args[0]);

		if (LOG.isInfoEnabled()) {
			LOG.info("fetching: " + url);
		}

		IndexingFilters indexers = new IndexingFilters(conf);

		ProtocolFactory factory = new ProtocolFactory(conf);
		Protocol protocol = factory.getProtocol(url);

		WebPage page = WebPage.newBuilder().build();
		page.setBaseUrl(new org.apache.avro.util.Utf8(url));
		ProtocolOutput protocolOutput = protocol.getProtocolOutput(url, page);
		page.setProtocolStatus(protocolOutput.getStatus());
		if (protocolOutput.getStatus()
				.getCode() == ProtocolStatusCodes.SUCCESS) {
			page.setStatus((int) CrawlStatus.STATUS_FETCHED);
			page.setFetchTime(System.currentTimeMillis());
		} else {
			LOG.error("Fetch failed with protocol status: "
					+ ProtocolStatusUtils
							.getName(protocolOutput.getStatus().getCode())
					+ ": " + ProtocolStatusUtils
							.getMessage(protocolOutput.getStatus()));
			return -1;
		}

		Content content = protocolOutput.getContent();
		if (content == null) {
			LOG.warn("No content for " + url);
			return 0;
		}

		page.setContent(ByteBuffer.wrap(content.getContent()));
		contentType = content.getContentType();
		if (contentType == null) {
			return -1;
		}
		page.setContentType(new Utf8(contentType));

		if (LOG.isInfoEnabled()) {
			LOG.info("parsing: " + url);
			LOG.info("contentType: " + contentType);
		}

		if (ParserJob.isTruncated(url, page)) {
			LOG.warn("Content is truncated, parse may fail!");
		}

		(new ParseUtil(conf)).process(url, page);
		if (!ParseStatusUtils.isSuccess(page.getParseStatus())) {
			LOG.warn("Problem with parse - check log");
			return (-1);
		}

		NutchDocument doc = new NutchDocument();
		doc.add("id", url);
		doc.add("digest", StringUtil.toHexString(page.getSignature()));

		try {
			doc = indexers.filter(doc, url, page);
		} catch (IndexingException e) {
			e.printStackTrace();
		}

		if (doc == null) {
			LOG.info("Document discarded by indexing filter");
			return 0;
		}

		for (String fname : doc.getFieldNames()) {
			List<String> values = doc.getFieldValues(fname);
			if (values != null) {
				for (Object value : values) {
					String str = value.toString();
					int minText = Math.min(100, str.length());
					System.out.println(
							fname + " :\t" + str.substring(0, minText));
				}
			}
		}
		return 0;
	}

	public static void main(String[] args) throws Exception {
		final int res = ToolRunner.run(NutchConfiguration.create(),
				new IndexingFiltersChecker(), args);
		System.exit(res);
	}

	Configuration conf;

	public Configuration getConf() {
		return conf;
	}

	@Override
	public void setConf(Configuration arg0) {
		conf = arg0;
	}
}
